Pinpoint Test D : No Power In On - Push Button Ignition Switch: Notes

Refer to Power Distribution for schematic and connector information.

Refer to Starting System for schematic and connector information.

Normal Operation and Fault Conditions

When in ON mode, the BCM activates the integral run/start relay and provides a ground to activate the BJB run/start relay, which distributes fused voltage to various components. The integral run/start relay in the BCM receives voltage from the BCM fuse 34 (30A). The BJB run/start relay receives voltage from the battery through the high current BJB. The BCM uses a Field-Effect Transistor (FET) to control the relays.

BCM DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
B108A:01	Start Button: General Electrical Failure	Sets if the BCM does not receive any signal from the push button ignition switch.
B108A:24	Start Button: Signal Stuck High	Sets if the BCM detects a short to voltage from the Start/Stop 1 input circuit from the push button ignition switch.
B1142:29	Ignition Status 1: Signal Invalid	Sets when the BCM does not receive a valid ignition signal during a BCM self test.
B1310:14	Run/Start Control: Circuit Short to Ground or Open	The BCM continuously monitors the control side of the run/start relay. This DTC is set if the BCM detects an open or a short to ground on the control circuit. The BCM uses a Field-Effect Transistor (FET) to control the run/start relay. When this DTC sets, the control side of the run/start relay is disabled via the Field-Effect Transistor (FET). Once the condition that caused the DTC to set is repaired, the BCM must pass a self-test in order for the DTC to clear and the system to resume normal operation.

Possible Causes

Battery
Wiring, terminals or connectors
Fuse
Relay
Push button ignition switch
PATS concern
BCM

Visual Inspection and Diagnostic Pre-checks

Inspect the battery and battery cables.
Inspect BCM fuse 18 (5A).
Inspect the BCM fuse 34 (30A).
Inspect the high current BCM fuse 2 (125A).